Failed to parse category definition – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to interpret the category definition due to incorrect syntax or format. This could be due to a missing or wrongly placed bracket, incorrect field name, or wrong data type. To resolve this issue, you should first verify the syntax and format of your category definition. Ensure that all brackets are correctly placed, field names are correct, and data types match the expected ones. If the error persists, consider simplifying your category definition to identify the problematic part.

This guide will help you check for common problems that cause the log ” failed to parse category definition ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “failed to parse category definition” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (augment) {
 } catch (IOException e) {
 throw new ElasticsearchParseException("failed to parse category definition"; e);
 QueryPage result = new QueryPage<>(